<template>
    <div>   
       <!-- 面包屑导航区域 -->
         <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>分类参数</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片区域 -->
        <el-card>
            <!-- 警告区域 -->
             <el-alert show-icon title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false"></el-alert>
             <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联选择框 -->
                <el-cascader v-model="selectedCateKeys" expand-trigger="hover" :options="catelist" :props="cateProps"   @change="handleChange"></el-cascader>
                
                </el-col>
            </el-row>
            <!-- tab页面区域 -->
           <el-tabs v-model="activeName"  @tab-click="handleTabClick">
               <!-- 动态属性区域 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" siaz="mini" :disabled="isBtnDisabled"  @click="addDialogVisible=true">添加参数</el-button>
                    <!-- 动态参数表格 -->
                     <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                 <!-- 静态属性区域 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" siaz="mini" :disabled="isBtnDisabled" @click="addDialogVisible=true">添加属性</el-button>
                    <!-- 静态属性表格 -->
                     <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)">
                                </el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <!-- 索引列 -->
                        <el-table-column type="index"></el-table-column>
                        <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                        <el-table-column label="操作">
                        <template slot-scope="scope">
                            <el-button size="mini" type="primary" icon="el-icon-edit"  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button size="mini" type="danger" icon="el-icon-delete"  @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
         
            </el-tabs>
        </el-card>
        <!-- 添加弹出框区域 -->
        <el-dialog :title="'添加'+titleText" :visible.sync="addDialogVisible" width="30%" @close="addDialogClosed">
           <el-form :model="addForm" status-icon :rules="addFormRules"  label-width="100px" class="demo-ruleForm" ref="addFormRef">
                <el-form-item :label="titleText+':'" prop="attr_name" >
                    <el-input  v-model="addForm.attr_name"></el-input>
                </el-form-item> 
           </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>
        <!-- 修改参数的对话框 -->
        <el-dialog :title="'修改' + titleText" :visible.sync="editDialogVisible" width="50%" >
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
            <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
        </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return{
            // 商品分类列表
            catelist:[],
             // 级联选择框的配置对象
            cateProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 被激活的页签的名称
            activeName: "many",
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            //级联属性
            selectedCateKeys: [],
            addDialogVisible:false,
            editDialogVisible:false,
            //添加弹出框
            addForm: {
                attr_name: ''
            },
            //修改弹出框
            editForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormRules: {
                attr_name: [
                { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            editFormRules:{
                 attr_name: [
                { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            }
        }
    },
    created() {
    this.getCateList()
    },
    methods:{
      async  getCateList(){
       const  {data:res}=  await this.$http.get('categories')
      
       if(res.meta.status!==200) return this.$message.error(res.meta.msg);
        this.catelist=res.data
      },
      //tab页面切换事件
      handleTabClick(){
         
         this.getParamsData()
      },
      // 级联选择框选中项变化，会触发这个函数
      handleChange(){
          this.getParamsData()
      },
        async getParamsData(){
           if (this.selectedCateKeys.length !== 3) {
             this.selectedCateKeys = []
             this.manyTableData=[]
             this.onlyTableData=[]
             return
           }
            //当selectedCateKeys.length===3时  发起请求
            const {data:res}= await this.$http.get(`categories/${this.cateId}/attributes`,{
                params:{sel:this.activeName}
            })
            if(res.meta.status!==200) return this.$message.error(res.meta.msg)
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
                   
                    // 控制文本框的显示与隐藏
                    item.inputVisible = false
                    // 文本框中输入的值
                    item.inputValue = ''
            })
           
            if(this.activeName==='many') {
                 this.manyTableData=res.data
            }else{
                 this.onlyTableData=res.data
            }  
        },
        // 重置修改的表单
        addDialogClosed() {
        this.$refs.addFormRef.resetFields()
        },
        //添加参数确定点击事件
        addParams(){
            this.$refs.addFormRef.validate(async valid => {
                if(!valid) return
                 const {data:res}= await this.$http.post(
                     `categories/${this.cateId}/attributes`,
                    {
                        attr_name: this.addForm.attr_name,
                        attr_sel: this.activeName
                    }
                );
                console.log(res)
                if(res.meta.status!==201) return this.$message.error(res.meta.msg)
                this.addDialogVisible=false
                this.getParamsData()
            })
        },
        //编辑按钮点击事件
        async showEditDialog(id){
          
           this.editDialogVisible=true
            const {data:res}=   await this.$http.get(`categories/${this.cateId}/attributes/${id}`,
            {
                params: { attr_sel: this.activeName }
            });
             if (res.meta.status !== 200) {
                return this.$message.error(res.meta.msg)
            }
             this.editForm = res.data
            
        },
        //编辑确定按钮点击事件
        editParams(){
            //做表单验证
           this.$refs.editFormRef.validate(async valid => {
              if(!valid) return 
                const {data:res}=  await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,{
                attr_name:this.editForm.attr_name,attr_sel:this.activeName
              })
             
              if(res.meta.status!==200) return this.$message.error(res.meta.msg)
                //更新数据
                this.getParamsData()
                //关闭弹出框
                this.editDialogVisible=false
           })
        },
        //删除按钮事件
       async removeParams(attr_id){
            const confirmResult = await this.$confirm(
                '此操作将永久删除该参数, 是否继续?',
                '提示',
                {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
                }
            ).catch(err => err)
            if(confirmResult!== 'confirm'){
                return this.$message.info("取消删除")
            }
            const {data:res}=  await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
            
            if(res.meta.status!==200) return this.$message.error(res.meta.msg)
            this.$message.success(res.meta.msg)
            this.getParamsData()
        },
        // 文本框失去焦点，或摁下了 Enter 都会触发
            async handleInputConfirm(row) {
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                // 如果没有return，则证明输入的内容，需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                // 需要发起请求，保存这次操作
                this.saveAttrVals(row)
            },
            async handleInputConfirm(row) {
                if (row.inputValue.trim().length === 0) {
                    row.inputValue = ''
                    row.inputVisible = false
                    return
                }
                // 如果没有return，则证明输入的内容，需要做后续处理
                row.attr_vals.push(row.inputValue.trim())
                row.inputValue = ''
                row.inputVisible = false
                // 需要发起请求，保存这次操作
                this.saveAttrVals(row)
             },
             // 将对 attr_vals 的操作，保存到数据库
            async saveAttrVals(row) {
            // 需要发起请求，保存这次操作
            const { data: res } = await this.$http.put(
                `categories/${this.cateId}/attributes/${row.attr_id}`,
                {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
                }
            )

            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！')
            }

            this.$message.success('修改参数项成功！')
            },
            // 点击按钮，展示文本输入框
            showInput(row) {
                row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会指定回调函数中的代码
                this.$nextTick(_ => {
                    this.$refs.saveTagInput.$refs.input.focus()
                })
            },
            // 删除对应的参数可选项
            handleClose(i, row) {
                row.attr_vals.splice(i, 1)
                this.saveAttrVals(row)
            }
        
    },
    computed:{
        isBtnDisabled(){
            if(this.selectedCateKeys.length!==3)return true
            return false
        },
        cateId() {
            if (this.selectedCateKeys.length === 3) {
                return this.selectedCateKeys[2]
            }
            return null
        },
        titleText(){
            if(this.activeName==='many') return '动态参数'
            return '静态属性'
        }
        
    }
}
</script>
<style lang="less" scoped>
    .el-card {
        margin-top: 15px;
    }
   .el-tag {
       margin-left: 10px;
   }
   .el-input {
       width: 100px;
   }
</style>
